Nouns denoting natural phenomena

gentle breeze
wind moving 8-12 knots; 3 on the Beaufort scale
 
sunset
atmospheric phenomena accompanying the daily disappearance of the sun
 
lightning
abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light
 
covalent bond
a chemical bond that involves sharing a pair of electrons between atoms in a molecule
 
mass defect
the amount by which the mass of an atomic nucleus is less than the sum of the masses of its constituent particles
 
twister
a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground
 
head sea
a sea in which the waves are running directly against the course of the ship
 
line squall
a squall advancing along a front that forms a definite line
 
frost
weather cold enough to cause freezing
 
whirlwind
a more or less vertical column of air whirling around itself as it moves over the surface of the Earth
 
fume
a cloud of fine particles suspended in a gas
 
heat wave
a wave of unusually hot weather
 
rainfall
water falling in drops from vapor condensed in the atmosphere
 
chemical energy
that part of the energy in a substance that can be released by a chemical reaction
 
exchange
chemical process in which one atom or ion or group changes places with another
 
brain wave
(neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
 
sea
turbulent water with swells of considerable size
 
black-body radiation
the electromagnetic radiation that would be radiated from an ideal black body; the distribution of energy in the radiated spectrum of a black body depends only on temperature and is determined by Planck's radiation law
 
placebo effect
any effect that seems to be a consequence of administering a placebo; the change is usually beneficial and is assumed result from the person's faith in the treatment or preconceptions about what the experimental drug was supposed to do; pharmacologists were the first to talk about placebo effects but now the idea has been generalized to many situations having nothing to do with drugs
 
van der Waal's forces
relatively weak attraction between neutral atoms and molecules arising from polarization induced in each particle by the presence of other particles
 
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